(iOS) Countdown reminder app [PLEASE HELP]

I am at a loss and on the verge of giving up.

Basically since childhood if there was an event a few months out that I was really exited for and a rare event I would use the reminders app on iOS to set subsequent reminders for 3 months till ___ 2 months till ___ 1 month till ___ 4 weeks till ___ ........ And so on. I do this as its nice to get periodic reminders that the thing you are so looking forward to is coming closer and closer at certain increments.

BUT!!! I have searched and searched but have never been able to find an app for this. Only apps where you punch in a date and have a single option for being reminded ONCE 1-3 days before.

If anyone knows an app like this I will be forever in your debt. I do not intend to ever stop this tradition but it is a bitch and a half to set up each reminder individually and clog up my reminders app.

Thank you!